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ACOUSTIC NAVIGATION SYSTEM

  • US 3,723,957 A
  • Filed: 11/20/1970
  • Issued: 03/27/1973
  • Est. Priority Date: 11/20/1970
  • Status: Expired due to Term
First Claim
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1. A marine acoustic navigation system comprising:

  • a. underwater support means;

    b. a pair of directional acoustic transducer arrays arranged together on said underwater support means and aimed at a small angle to each other to produce a pair of acoustic beams directed through the water and closely straddling a plane bisecting said angle;

    c. a source of oscillatory energy;

    d. a code generator;

    e. switching means controlled by said code generator for applying said energy alternately to said transducer arrays for predetermined intervals to form said acoustic means with complementary code patterns that are alternately nutating on and off;

    f. a vessel-mounted transducer for receiving said acoustic beams and forming electric analog signals of said beams; and

    g. means for aurally displaying said analog signals so that a listener can distinguish the code of one of said beams on one side of said bisector plane, and the code of the other of said beams on the other side of said bisector plane, and a steady tone on said bisector plane.

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